How to add an account to your Microsoft account

Applies to Windows 8.1, Windows RT 8.1

If you have an account with a web service like Facebook, LinkedIn, or Twitter, you can add it to your Microsoft account. This connects the two accounts and allows specific info to be shared between them so you can use it in your apps and other places where you sign in with a Microsoft account.
For example, if you add an account that contains your friends' contact info, you can choose to show that info in the People and Mail apps.
Microsoft won’t share info associated with your Microsoft account without your permission.